[flexcoders] Flex Button Datagrid trigger event

[timgerr]

Hello all,
I have a datagrid that I added a button to it.  I am having troubles
with the button and other things,  Here is some code:

public function DoThis(e:DataGridEvent):void
{
 trace(dta.selectedItem.cert;)
                        
}
<mx:DataGrid x="311" y="208" dataProvider="{dataArrayItemOne}" id="dta">
                <mx:columns>
                        <mx:DataGridColumn headerText="Cert Date" 
dataField="certdate"/>
                        <mx:DataGridColumn headerText="Certification" 
dataField="cert"/>
                        <mx:DataGridColumn headerText="" dataField="test_id" 
width="80">
                                <mx:itemRenderer>
                                        <mx:Component>
                                                <mx:HBox 
horizontalAlign="center">
                                                        <mx:Button label="Press 
Me" click="DoThis(event)"/>       
                                                </mx:HBox>                      
           
                                        </mx:Component>
                                </mx:itemRenderer>
                        </mx:DataGridColumn>                    
                </mx:columns>
        </mx:DataGrid>

The first problem is I am getting an error "Call to possibly undefined
method DoThis".  And can I use the event to trigget the method and get
the DataGridEvent?

Thanks,
timgerr